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adobe flash players uses and features given below

Features

Adobe Flash Player is a runtime that executes and displays content from a provided SWF file, although it has no in-built features to modify the SWF file at runtime. It can execute software written in the ActionScript programming language which enables the runtime manipulation of text, data, vector graphics, raster graphics, sound and video. The player can also access certain connected hardware devices, including web cameras and microphones, after permission for the same has been granted by the user.

Flash Player is used internally by the Adobe Integrated Runtime (AIR), to provide a cross-platform runtime environment for desktop applications and mobile applications. AIR supports installable applications on Windows, Linux, macOS, and some mobile operating systems such as iOS and Android. Flash applications must specifically be built for the AIR runtime to use additional features provided, such as file system integration, native client extensions, native window/screen integration, taskbar/dock integration, and hardware integration with connected Accelerometer and GPS devices.

Data formats

Flash Player includes native support for many different data formats, some of which can only be accessed through the ActionScript scripting interface.

• XML: Flash Player has included native support for XML parsing and generation since version 8. XML data is held in memory as an XML Document Object Model, and can be manipulated using ActionScript. ActionScript 3 also supports ECMAScript for XML (E4X), which allows XML data to be manipulated more easily.
• JSON: Flash Player 11 includes native support for importing and exporting data in the JavaScript Object Notation (JSON) format, which allows interoperability with web services and JavaScript programs.
• AMF: Flash Player allows application data to be stored on users computers, in the form of Local Shared Objects, the Flash equivalent to browser cookies. Flash Player can also natively read and write files in the Action Message Format, the default data format for Local Shared Objects. Since the AMF format specification is published, data can be transferred to and from Flash applications using AMF datasets instead of JSON or XML, reducing the need for parsing and validating such data.
• SWF: The specification for the SWF file format was published by Adobe, enabling the development of the SWX Format project, which used the SWF file format and AMF as a means for Flash applications to exchange data with server side applications. The SWX system stores data as standard SWF bytecode which is automatically interpreted by Flash Player. Another open-source project, SWXml allows Flash applications to load XML files as native ActionScript objects without any client-side XML parsing, by converting XML files to SWF/AMF on the server.

Multimedia formats

Flash Player is primarily a graphics and multimedia platform, and has supported raster graphics and vector graphics since its earliest version. It supports the following different multimedia formats which it can natively decode and playback.

• MP3: Support for decoding and playback of streaming MPEG-2 Audio Layer III (MP3) audio was introduced in Flash Player 4. MP3 files can be accessed and played back from a server via HTTP, or embedded inside an SWF file, which is also a streaming format.
• FLV: Support for decoding and playing back video and audio inside Flash Video (FLV and F4V) files, a format developed by Adobe Systems and Macromedia. Flash Video is only a container format and supports multiple different video codecs, such as Sorenson Spark, VP6 and more recently H.264 . Flash Player uses hardware acceleration to display video where present, using technologies such as DirectX Video Acceleration and OpenGL to do so. Flash Video is used by YouTube, Hulu, Yahoo! Video, BBC Online and other news providers. FLV files can be played back from a server using HTTP progressive download, and can also be embedded inside an SWF file. Flash Video can also be streamed via RTMP using the Adobe Flash Media Server or other such server-side software.
• PNG: Support for decoding and rendering Portable Network Graphics (PNG) images, in both its 24-bit (opaque) and 32-bit (semi-transparent) variants. Flash Player 11 can also encode a PNG bitmap via ActionScript.
• JPEG: Support for decoding and rendering compressed JPEG images. Flash Player 10 added support for the JPEG-XR advanced image compression standard developed by Microsoft Corporation, which results in better compression and quality than JPEG. JPEG-XR enables lossy and lossless compression with or without alpha channel transparency. Flash Player 11 can also encode a JPEG or JPEG-XR bitmap via ActionScript.
• GIF: Support for decoding and rendering compressed Graphics Interchange Format (GIF) images, in its single-frame variants only. Loading a multi-frame GIF will display only the first image frame.

Streaming protocols

• HTTP: Support for communicating with web servers using HTTP requests and POST data. However, only websites that explicitly allow Flash to connect to them can be accessed via HTTP or sockets, to prevent Flash being used as a tool for cross-site request forgery, cross-site scripting, DNS rebinding and denial-of-service attacks. Websites must host a certain XML file termed a cross domain policy, allowing or denying Flash content from specific websites to connect to them. Certain websites, such as Digg, Flickr, Photobucket already host a cross domain policy that permits Flash content to access their website via HTTP.
• RTMP: Support for live audio and video streaming using the Real Time Messaging Protocol (RTMP) developed by Macromedia. RTMP supports a non-encrypted version over the Transmission Control Protocol (TCP) or an encrypted version over a secure Transport Layer Security (SSL) connection. RTMPT can also be encapsulated within HTTP requests to traverse firewalls that only allow HTTP traffic.
• TCP: Support for Transmission Control Protocol (TCP) Internet socket communication to communicate with any type of server, using stream sockets. Sockets can be used only via ActionScript, and can transfer plain text, XML or binary data (ActionScript 3.0 and later). To prevent security issues, web servers that permit Flash content to communicate with them using sockets must host an XML-based cross domain policy file, served on Port 843.^[30] Sockets enable AS3 programs to interface with any kind of server software, such as MySQL.^[31]

Performance

Hardware acceleration

Until version 10 of the Flash player, there was no support for GPU acceleration. Version 10 added a limited form of support for shaders on materials in the form of the Pixel Bender API, but still did not have GPU-accelerated 3D vertex processing.^]A significant change came in version 11, which added a new low-level API called Stage3D (initially code named Molehill), which provides full GPU acceleration, similar to WebGL. (The partial support for GPU acceleration in Pixel Bender was completely removed in Flash 11.8, resulting in the disruption of some projects like MIT's Scratch, which lacked the manpower to re  code their applications quickly enough.

Current versions of Flash Player are optimized to use hardware acceleration for video playback and 3D graphics rendering on many devices, including desktop computers. Performance is similar to HTML5 video playback. Also, Flash Player has been used on multiple mobile devices as a primary user interface renderer.

Compilation

Although code written in Action Script 3 executes up to 10 times faster than the prior Action Script 2, the Adobe Action Script 3 compiler is a non-optimizing compiler, and produces inefficient byte code in the resulting SWF, when compared to tool kits such as Cross Bridge.

Cross Bridge, a toolkit that targets C++ code to run within the Flash Player, uses the LLVM compiler to produce byte code that runs up to 10 times faster than code the Action Script 3 compiler produces, only because the LLVM compiler uses more aggressive optimization.

Adobe has released Action Script Compiler 2 (ASC2) in Flex 4.7 and on wards, which improves compilation times and optimizes the generated byte code and supports method in lining, improving its performance at run time.

As of 2012, the Haxemultiplatform language can build programs for Flash Player that perform faster than the same application built with the Adobe Flex SDK compiler.

Development methods

Flash Player applications and games can be built in two significantly different methods:

• "Flex" applications: The Adobe Flex Framework is an integrated collection of stylable Graphical User Interface, data manipulation and networking components, and applications built upon it are termed "Flex" applications. Startup time is reduced since the Flex framework must be downloaded before the application begins, and weighs in at approximately 500 KB. Editors include Adobe Flash Builder and FlashDevelop.
• "Pure ActionScript" applications: Applications built without the Flex framework allow greater flexibility and performance.Video games built for Flash Player are typically pure-Actionscript projects. Various open-source component frameworks are available for pure ActionScript projects, such as MadComponents, that provide UI Components at significantly smaller SWF file sizes.

In both methods, developers can access the full Flash Player set of functions, including text, vector graphics, bitmap graphics, video, audio, camera, microphone, and others. AIR also includes added features such as file system integration, native extensions, native desktop integration, and hardware integration with connected devices.